[scm] fix subtitle for older messages without username specified
Merge branch 'develop' into feature/scm-old-message-bugfix
Merge branch 'develop' of github.com:fedora-infra/fedmsg_meta_fedora_infrastructure into feature/scm-old-message-bugfix
Add test suite to cover older SCM messages without username specified
Merge pull request #34 from fedora-infra/feature/scm-old-message-bugfix

Fix subtitle for older SCM messages without username specified